基于调制切换的逆变器高频谐振故障穿越方法  

High-frequency resonance fault ride-through for inverter based on modulation switching

作　　者：吴显 于德硕 刘子俊 姜鑫 谢懿晗 易皓[2] WU Xian;YU Deshuo;LIU Zijun;JIANG Xin;XIE Yihan;YI Hao(New Smart City High Quality Power Supply Joint Laboratory of China Southern Power Grid Company Limited(Shenzhen Power Supply Co.,Ltd.),Shenzhen 518020,China;School of Electrical Engineering,Xi'an Jiaotong University,Xi'an 710049,China)

机构地区：[1]新型智慧城市高品质供电联合实验室(深圳供电局有限公司),广东深圳518020 [2]西安交通大学电气工程学院,陕西西安710049

出　　处：《供用电》2024年第5期96-102,共7页Distribution & Utilization

基　　金：中国南方电网有限责任公司科技项目(090000KK52220014/SZKJXM20220021)。

摘　　要：随着能源转型和低碳社会建设不断推进,新能源设备广泛地接入电网的各个环节,以逆变器为代表的新能源设备存在宽频谐振风险。LCL滤波器无源谐振峰是引发逆变器高频谐振的主要因素,而传统的有源阻尼控制及参数配置方法对网侧参数存在适应能力较差且配置较为复杂等问题。针对滞环开关频率不确定的缺陷,设计了一种基于调制切换的逆变器高频谐振抑制方法,利用滞环电流控制的快速性与鲁棒性,提出了调制切换策略以保证模态切换瞬间开关动作的平滑过渡。所提方法能够替代逆变器电流环,并利用滞环电流控制的优势达到快速平抑高频无源谐振的目的,为逆变器在网侧恶化工况下的高频故障穿越提供了有效支撑。并通过仿真验证其有效性与模态切换的平滑性。With the energy transformation and the construction of a low-carbon society,new energy equipment is widely connected to all links of the power grid.New energy equipment represented by inverters has the risk of broadband resonance.The passive resonance peak of the LCL filter is the main factor causing high-frequency resonance in the inverter.However,the traditional active damping control and parameter configuration methods have poor adaptability to grid-side parameters and complicated configuration.Taking advantage of the rapidity and robustness of hysteresis current control,a high frequency resonance suppression method for inverters based on modulation switching is designed,and a hysteresis closed-loop fixed frequency strategy is proposed to deal with the defect of uncertain hysteresis switching frequency.The switching strategy is modulated to maintain a smooth transition of the switching action at the instant of mode switching.The proposed method can replace the inverter current loop and take advantage of hysteresis current control to quickly suppress high-frequency passive resonance,which provides effective support for the inverter's high-frequency fault ride-through under deteriorated grid-side conditions.Simulation verification is performed,and the results verified the effectiveness of the proposed resonance suppression strategy and the smoothness of mode switching.

关 键 词：LCL滤波器 高频谐振 新能源 逆变器 滞环电流控制 鲁棒性 

分 类 号：TM46[电气工程—电器]